1999 Chevrolet Venture 3.4L - wipers only function on high speed

Learn how to test electrical circuits ! Find a wiring diagram so you know which wires to test . Free wiring diagrams here http://www.bbbind.com/free_tsb.html Enter vehicle info. year , make , model and engine size . Under system click on body & accessories , then under subsystem click on wipers / washers .Check B+ voltage and ground circuits .
Wiper Motor Switch Troubleshooting
Windshield Wiper Motor Wiring Tutorial

May have broken a connection/shorting in the blower resistor pack which controls motor speed. Can get fragile with older vehicles.

I would be looking at replacing the wiper motor....the wiper switch is just that, a switch to tell the wiper motor what to do.....most of the wiring is housed internal of the wiper motor such as the park circuit and the speeds........osunds like an internal fault.....replacement would be advised

The wiper linkage and blades should be in the neutral position, or where they would normally lie when in the "off" position. Hope this helps. Remember to disconnect the battery while replacing electrical components.

needs a wiper module, pretty sure.

need to change your wiper motor.

It sounds like the switch went out. I have seen a lot of GM products have this same problem.

I had the same thing - it also affects the 4 way flashers.  you'll end up replacing the entire control arm (turn signal lever)
Good luck!

You will need to replace the wiper transmission.This is a common problem.

This is a Common Problem On Chevy's. The easiest way is to get a New Wiper Motor and Install it. Very Easy to do and Cheaper than a Mechanic.